Just to add to the confusion, TIMTOWTDI
use 5.18.0;
use warnings;
my $string = "AAATTTAGTTCTTAAGGCTGACATCGGTTTACGTCAGCGTTACCCCCCAAGTTATT
+GGGGACTTT";
my %subs;
$subs{$_}++ for grep { length >= 2 } split m/,/ => ($string =~ s/([ACG
+T])\K(?!\1)/,/gr);
printf "%5d %3d %s\n", $subs{$_->[1]}, @$_ for sort { $b->[0] <=> $a->
+[0] || $a->[1] cmp $b->[1] } map {[ length, $_ ]} keys %subs;
1 6 CCCCCC
1 4 GGGG
1 3 AAA
3 3 TTT
2 2 AA
2 2 GG
5 2 TT
Enjoy, Have FUN! H.Merijn
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